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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of year | $ 50.5 | $ 43.7 | $ 47.2
Additions for tax positions of prior years | 2.9 | 8.4 | 3.1
Additions for tax positions of current year | 0.0 | 1.5 | 1.5
Reductions for tax positions of prior years | (1.1) | (2.5) | (8.2)
Acquisitions | 1.4 | 0.0 | 5.3
Decrease resulting from foreign currency translation | (8.6) | (0.6) | (5.2)
Balance at end of year | $ 45.1 | $ 50.5 | $ 43.7

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